I played the new version of Pirates! for quite a while, but my cats hated the sounds that it generated, so I stopped. Ok, so that's not really why... it had more to do with finding Pescado's hacks, thus making Sims2 so much more interesting and enjoyable, or something along those lines.
I also enjoyed Meier's Civilization III. I found that it's almost as addictive as Sims2.
Down the road, I plan to play the copy World of Warcraft that my husband bought for me quite some time ago. That is, I'll be playing it as soon as I can tear myself away from Sims2.